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Effect of ethanol on cortical spreading depression
1Departamento de Nutrição, Universidade Federal de Pernambuco, Recife, Brasil.
Summary
Seven-day intragastric ethanol administration increased cortical spreading depression (SD) velocities in rats. Ethanol-treated rats showed heightened susceptibility of the cerebral cortex to SD, impacting weight gain.
Area of Science:
- Neuroscience
- Pharmacology
- Toxicology
Background:
- Cortical spreading depression (SD) is a wave of neuronal and glial depolarization.
- Ethanol's effects on neuronal excitability and cortical function are not fully understood.
- Investigating ethanol's impact on SD provides insights into neurophysiological alterations.
Purpose of the Study:
- To determine the effects of sub-chronic intragastric ethanol administration on cortical spreading depression (SD) in adult rats.
- To assess changes in SD velocity and cortical excitability following ethanol exposure.
- To evaluate the impact of ethanol on animal weight gain as an indicator of systemic effects.
Main Methods:
- Adult Wistar rats received daily intragastric ethanol (3 g/kg) or distilled water for 7 days.
- Cortical spreading depression (SD) was induced using KCl stimulation on the frontal cortex.
- SD propagation was recorded on the parietal surface, measuring velocity over 6 hours.
Main Results:
- Ethanol-treated rats exhibited significantly higher mean SD velocities compared to controls.
- The difference in SD velocity between groups was significant up to 4 hours post-induction.
- Ethanol-treated rats showed no weight gain, while controls gained an average of 17g.
Conclusions:
- Seven-day ethanol intake increases the susceptibility of the cerebral cortex to cortical spreading depression (SD) in rats.
- Ethanol exposure alters neuronal function, leading to faster SD propagation.
- These findings suggest ethanol can induce neurophysiological changes affecting cortical excitability.